Apparatus for cleaning air or gas filters.



P. KESTNER. APPARATUS POR CLEANING AIR 0R GAS FILTERS. APPLICATION IILED NOV. I0, 190B. 996,860, Patented July 4, 1911.

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I?. .KESTNER- APPARATUS POR CLEANING A1B 0R GAS FILTERS.

APPLIUATION FILED NOVJO, 1908.

Patented July 4,1911.

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PAUL KEsTNnR, or LILLE,v FRANCE.

` APPARATUS` FOR CLEANING AIR 0R GAS FILTERS.

996,860. 4 y y Original applicatinfled February 4,

Specification of Letters Patent.

Patented July 4, 1911 1907, Serial No. 355,587. Divided and thisapplication led'November 10, 1908. Serial No. 461,992:

Toall whom it 'may concern:

v Be it known that I, PAUL KESTNER, a citizen' of the French Republic,residing at .Lille, in the NordProvin'ce of France, have invented a newand useful Apparat-us for.

following is a specification.

This invention has reference to an: apparatus for cleaning air and gasfilters wherein the air or gas is forced or caused to pass through asuitable fabric,such as fiannellet or other porous filtering material,

Cleaning Air or Gas Filters, of which the and the present application isa division of my application Serial No. 355,587, filed 4th February1907.

In practice the filtering material, after having been in use for agreater `or less period of time, becomes coated with the'impuritiesdeposited thereon by the air or gas as it passes therethrough, thecoating caus-.

ing the interstices inthe filtering material to be choked up therebyeither reducing the quantity of air which Will pass through in a givenperiod of time or requiring an increase of pressure, until at last thefilter must be lput out of use to enable the filtering material to becleaned.

4 1 Unless a spare filter is at hand which can 3oibe used While thefirst one is being cleaned,

the su ply of filtered air or gas is ofcourse eut off) during suchperiod of cleaning the material which, may be a great inconvenience,but, if, on thel other hand, `a spare filter is provided to be used toavoid such inconvenience, not only is the original cost as least doubledbut the space `required to contain the filters is also doubled."

` My invention consists in improved filtercleaning apparatus of the typein which av l* pneumatic suction device 1s provided for cleaningIthe-filtering screen while the filtering operation is proceeding,theobject of the invention being to economize suction power whileinsuring thorough cleaning of the' filtering surfaceand obviating chokmgof the suction nozzle.

In` the known-apparatus, a suction nozzle with a long narrow intakeextends across the screen from side to side and the screen or the nozzleis moved to bring a fresh strip of the filtering surface underthe` saidintake. If they intake be very narrow it is liable to become choked, andif it bewide enough to avoid choking the suction power required for evena comparatively small screen is very ance with my invention, the nozzlesemployed being ordinary circular nozzles of appronimately the samediameter as t-he suc! tion pipe, and consequently not liable to be-lcome choked, and having two motions imparted to them to enable them totravel over the whole of the filtering surface while actmg with theirfull force on a small area ata time.'

In order that my invention may be readily understood I have appendeddrawings hereto to illustrate a simpleform of apparatus whereby my said`invention may be carried into practice.

In the said drawings Figures l and 2 are a side elevation and tively ofmy appara-tus applied to a vertically arranged drum filter. Figs. 3, 4and 5 are enlarged views of details to be referred to, and Fig. 6 is aview at right angles to that shown in Fig. l of the tube G and starwheelV.

In these drawings A indicates a circular drum made of perforated metalor of wire gauze or lattice which is covered on its outer periphery withflannellet or other suitable material adapted to be used for filteringair or gas. The said drum is liXedly held in a vertical position by asuitable frame C .and is provided with an outlet B which outlet leads toor has within it an exhauster-not shown-of any known suitableconstruction by means of which air or. gas is drawn through theflannellet or other materiall whereby said air or gas is filtered andrendered clean and free from dust.

For the purpose of cleaning the filtering material I provide thefollowing:Imme diatelybelow the center of the filter drum A I support ahorizontally rotatable hollow socket E which carries a horizontal tube Dof a length so that its free end projects a suitable distance beyond thelplane of the periphery of the drum, and at its 'free' end I providesaid tube D with a vertical tube G of preferably the shape shown, whichtubev is held near to and parallel with the filtering surface. Byrotating the socket Ev the tube G will be carried around the circu-v larfilter.

For imparting thenecessary rotary motion to the socket E I provide theframe C plan View respecing operation is 'being effected, the tube Gr isat a suitable part of the pulley J-to which rotaryvmotion isimpartedfroin any suitable source-and on said socket I provide a pul-'ley H, a cord or equivalent-guided by rollers 7' if and asrequired-passing around both said pulleys. Thesocltet E 1s 1ncommunlcatlon with an exhaust p1 e F which vlatter leads lto anyknownsuitab e exhauster (not shown).

I form one side L of the tube G with a slot N and passingco1npletely.around said tube in its vertical direction I provide a beltP whichserves to'close the slot N and to the outer face of said belt Iattach a suction or exhaust nozzle O whose free end reaches into contact`with the' outer face 'of the flannellet or other filteringl material.At the point where the nozzle is fixed to the belt P I form said beltwith a slot or aperture the arrangement being such that when a suctionorex hausting effect is 'producedin the pipeF air or gas will be drawnfrom the interior of' the drum through the' filtering materialf-x'vhichar orgas then passes through the f so rotating comparativelyslowly around the drum in the manner and by 'the means already dascribedso that' the surfacewhich is being c eaned is constantly changing.

When. the tube G has rotatedonce com pl'etelyaround the 'drum' it isnecessary to Vchange the'vertical position of the exhaust nozzle so thata lower strip ofthe filtering material will onthe next rotation of thetubeG becleaned. For thisy purpose I pro'- vide means such as a toothedor star Wheel U which is rotated through the ldistance of one tooth at'each rotation dof the tube G by coming 1n contact with a stop V.; on axed.

paitof the frame -the 'belt P being so con! nected to the star wheelthat'it will be moved slightly/.around the tube G. It desired two ormore stops V may be provided so that'the belt P and with it the exhaust'nozzle O will L be'moved twice or more frequently for each revolution ofthe tube G..

.It will be noticed that 'in the arrangement i'60.hereinbefore'describedthe belt P serves not v only ,to close ,the slot N .(so that air or .gas

- can be drawn only through the exhaust; nozzle i'nto the tube G) andvto"carry the nozzle V but also to move it -in a vertical direction asrequired.'

^ Ifjdesired two or more exhaust nozzles O may be provided-so that sosoon as or even before one Iof the nozzles has reached the bottom or oneend of the drum A another nozzle will already vhave been brought into4 Ioperative position at the top or at the other end of the drum. When oneof the nozzles has reached-say the bottom of the tube vGr it will becarried around the half-round end of' the latter and will then becarried up the other side K vthereof but as the latteris not formed witha slotno air or gas can be drawn through said nozzle until it has beencarried over the top end of the tube G and into' communication with theslot N on the other side Lof said tube.

Instead of employing the k'belt P to carry around the exhaust nozzlesI'Inay .utilizethe belt for the purpose only of closing the .v v

slot N excepting so far as communication must be open `between theexhaust. nozzle and the tube Gr. An arrangement of this kind is shown inFigs.v 3, 4 and 5: The u nozzle O is slidable ony the face of the tubeGand iscarried by a';travelerwhichis provided withthree rollers 1, 2 and3 and the' traveler can be moved up and down on the belt P is passedaround these so that thetube G without the belt sliding'on said tube.

The rollers are provided with springs 4, and 5 which tend lto push therollers/3 outward and thuskeep the belt taut and I also provide a spring6 whereby the carrier and nozzle will be held in close contactwith thetube.

' The requisite motion is imparted to the carrierby Ychains R and .Swhich pass over.

toothed wheels T and which are removed by a star yWheel U comingVinscontact with a stop or stops V as already/described.

The apparatus vand means I have described for imparting motion tothe'exhaust nozzles are intendedionly for the/purpose of illustrating apractical manner in which. my invention maybe carried into eli'ect and Iwish it to be understood thatI do not intend 'therethat particulare011-l by to limit myself to struction. What I claim as m 1. Th@lcombination' with' a exea arm.

invention and desire. 7 -to 'secureby Letters' atent 1s:-' 115 shapedfilter for ltering air or gas by drawingsame through a' filteringfabrievmounted 'on the periphery of the drum, of a hollow socket mountedexteriorly of the drum and'- .rotatableon the :axis thereof and lincommunication with` an exhauster,a ,tube einv tending radially from thesaid 'socket fbe yondthe periphery' of the said-l drum, -a I slottedtube mounted. on the end V'of the siaidradial tube and extending acrossthe pe-f ri h'ery of t e drum, means foi-,rotating the' said hollowsocketltogether with` thesaid radial tube and vslotted tube, a beltmounted to slide longitudinally upon .the saidslotted tube, anaperturein Ithe said belt, asuction:1

no zzle mounted on the said belt over the saidI belt and nozzlelongitudinally upon the slotted tube. l

2. e combination with a lixed drum! "shaped filtery for filtering air orgas by drawlng same through a ltermg fabric mounted Y v on-`theperiph'ery of the drum, of'a hollow socket mounted exteriorly ofthe drum and rotatable on the' axis thereof and in communication with anexhauster, a tube ex- A tending radially from thel said socket beyondthe periphery of the said drum, a slotted tubemount'ed onthe endof theIsaid radial tube andl extending vacross the pevtudin'ally and ripheryof the drum, means l'forrota'ting the said hollow socket togethery withthe said radial tube and slotted tube, an endless belt which embracesthe said slotted tube longipasses over a nozzle carrier 20 adapted toroll on the said belt, said nozzle carrier and means for automaticallydisplacing same longitudinally of the slotted tube.

In testimony whereof I have signed my name to this specification in thepresence of 25 two subscribing witnesses. x

p PAUL KESTNER. Witnesses: v

HENRI CHARRmR, LONPECKEL. y

